The Soundboard requires the most care, since it will define fundamentally the sound of the flamenco guitar
The top or soundboard is worked carefully to achieve the optimum thickness of about 2mm, when using stiff spruce, decreasing slightly from the center to outside edge. On the upper side of the soundboard, around the sound hole, a beautiful decorative rosette is placed, consisting of about 8000 tiny handmade pieces of different coloured, inlaid woods. On the inside of the soundboard flamenco guitar makers place struts, reinforcing the thin soundboard and fan braces, tuned to the proper key. The tuning of the fan braces will vary a little above F#-G. Since the guitar strings generate intensive pressure on the bridge of the soundboard, most but not all flamenco guitar makers, use a thin wide brace, called 'contra puente', to stiffen the area below the bridge. The soundboard of a flamenco guitar uses thin fan bracing as opposed to X-bracing, used on steel string guitars or ladder bracing used on cheap plywood guitars. Since the soundboard remains in the solera when the braces are glued to the soundboard, the flamenco guitar maker is able to construct a domed soundboard on the lower bout. This domed top gives the flamenco guitar its strong sound projection. However Flamenco guitars are built with only a very small doming of the top in comparison with classical guitars.